First, clear the trading environment of Diablo Ⅲ. Diablo Ⅲ trading environment can be said to be made up of three parallel organization, coin auction, cash auction, player and NPC transactions within the game. Gold trading and cash transaction lines can be viewed as trading price is not determined by the supply and demand sides’ full market economy, game vendor involved in the transaction, nor does it affect the pricing of commodities. However it is worth mentioning that, NPC transactions within the game can be seen as with Blizzard to oligarch monopoly economy, because it has decided to price right. This makes, though Blizzard does not directly participate in the auction house transactions, but indirectly through the NPC transaction pricing market, it will indirectly affect the auction house price of some goods diablo Ⅲ gold, which we later.